When ever I see a mini toy at a flea market I tend to buy it. I don't collect them, I have no idea about them. They seem rough to me.
A quick search on eBay and seems like they are worth something.
The 177 works cooper for example seems to go for around 30 in rough shape. The wheels on mine seem a bit different, but I have no idea.
Here is a selection any valuations welcome
Corgi BMC mini cooper 's'
Corgi BMC mini cooper 's'
Swedish made
A weird one: